package Problem;
import java.util.Scanner;

class TreeNode {
    public char val;
    public TreeNode left;
    public TreeNode right;
    public TreeNode(char val) {
        this.val = val;
    }
}
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String s = in.nextLine();
            TreeNode node = createTree(s);
            inOrder(node);
        }
    }
    public static int i = 0;
    private static TreeNode createTree(String str) {
        TreeNode root = null;

        if(str.charAt(i) != '#') {
            root = new TreeNode(str.charAt(i));
            i++;
            root.left = createTree(str);
            root.right = createTree(str);
        } else {
            i++;
        }

        return root;
    }
    public static void inOrder (TreeNode node) {
        if(node == null) {
            return;
        }
        inOrder(node.left);
        System.out.print(node.val + " ");
        inOrder(node.right);

    }
}
